Synthesis and characterisation of tin(IV) and organotin(IV) derivatives 2-{[(2-hydroxyphenyl) imino]methyl}phenol

From the interaction of 2-{[(2-hydroxyphenyl)imino]methyllphenol(salopH(2)) with tin and organotin(IV) acceptors, the derivatives [SnR3(salopH)](R = Me or Bu-n, [SnR2(Salop)] (R = Me, Bu-n Bu-n Vin or Ph), [SnRX(salop)(solvent)] (R = Me, Bu-n Ph or X; X = Cl, Br or I; solvent = CH,OH or H2O), [Sn(salop)(2)], [R2SnCl2(salopH(2))] (R = Me or Bu-n) have been obtained and characterised. The chelates, containing the Schiff base in mono or dianionic form, are generally stable both in the solid state and in solution, whereas the [SnR2Cl2(salopH(2))] adducts slowly decompose in acetone or DMSO yielding [SnR2(salop)] and releasing HCL. All the [SnR2(salop)] and [SnR2(salop)(solvent)] complexes are fluxional in solution. The Sn-119 NMR chemical shift is a function of the number of R groups. The X-ray single crystal diffraction study of [SnVin(2)(salop)] shows the metal to be five-coordinate in a distorted square pyramidal environment, Sn-C distances being 2.112(2) and 2.113(2) Angstrom, Sn-O 2.117(2) and 2.125(2) Angstrom and Sn-N 2.227(2) Angstrom. The whole structure consists of molecular units connected by weak intermolecular Sn-O interactions. In the complexes [SnX2(salop)(CH3OH)]. CH3OH complexes (X = Cl or Br), the tin atom is found in a strongly distorted octahedral environment with the Sn-O bond ranging from 1.995(3) to 2.055(2) Angstrom. The Sn-N bond is 2.116(4) Angstrom in the bromide and 2.171(3) Angstrom in the chloride complex. (C) 2001 Published by Elsevier Science B.V.